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Guys,

when I today lifted off the floor carpet of my RMWagon on the passenger side, I found frightening some brown epidemic on the front RH side in the region of the A-pillar at the doorsill. First i was scared about rust Perforation, but when checking properly it´s not through. Theres a small sheet metal clamp which fixes the cabel channel, this clamp is dissipated by rust and caused a terrible look, but no welding is required, just cleaning, derusting and sealing.

But what I´m much more interested in is the reason of the moisture which might be present for sure. I own the car since 4 weeks now and didn´t move it in traffic at all, but when I took it home for 250 miles I realized a coolant smell inside what disappeared for some time and came back again, maybe quarter-hourly. I`ve heard by some rumours that moisture occuring on Buicks RM/ Chevys Caprice exactly in this area is well known by the experts and the reason can be the heater core or the A/C? Could anyone tell me the reasons and problems to supress this problem? The car is inside stripped down and everything would be nice to get at.

Thanks lot for your help!

Udo
 

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A leaking heater core is the most likely cause for the symptoms you describe.

Search heater core removal, and "the bolt".

THE BOLT is in the back of the HVAC drain pan, right up near the firewall, in a difficult location to reach.

I forget the size, I think a 5.5mm socket. I attached it to this:

ImageUploadedByAutoGuide1454277549.164892.jpg
ImageUploadedByAutoGuide1454277567.856959.jpg

Check eBay for the OEM heater core, MUCH BETTER. I think someone on the forum here was selling one recently.
 

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I forgot, there's a drain that goes from the forward side of the HVAC drip pan through the firewall. It may have come loose. I'd check that first before pulling everything apart.
 

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Oh wait, you smelled coolant... DUH.

Never mind, pull everything apart...
 

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Discussion Starter #5
@ocala,

what means DUH? (Remember I´m German :confused:)

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
 

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duh
də/
exclamationinformal

exclamation: duh

  1. used to comment on an action perceived as foolish or stupid, or a statement perceived as obvious.
    "I left the keys in the ignition—duh!"



 

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@ocala,

what means DUH? (Remember I´m German :confused:)

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
I would detach the hoses from where the heater core comes through the firewall. Possibly secure them in the up position so you don't loose all of your coolant.

Then when you have the core ready to remove just try to hold the ends up as you remove it.
 

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@ocala,

what means DUH? (Remember I´m German :confused:)

Anyway, lots of thanks for your help. Should I just drain the heater core or have I to drain the whole engine coolant?

BuickRM
There's nothing here in this post that would indicate you are German. Please fill out your user profile to include that information. That might help.

But to answer your question, I agree with others, that sounds like a heater core leak. It's also a good idea to verify that your Air Conditioning evaporator drain is actually draining out of the passenger compartment through the passenger side firewall. The problem could be a combination of the two, so double-check.
 

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Udo

Make it easy on yourself, remove the front passenger seat. Find a piece of carpet or cardboard to cover the studs that hold the chair.

Also, where the heater hoses connect to the heater core, you may find them "baked" on, on top of being somewhat hard to get at. Rather then waste a lot of time, I have cut the heater core lines coming out of the firewall with a hacksaw blade. Saved a lot of aggravation.

Tom
 

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Discussion Starter #10
Thanks a lot to all, really good advices, my seats are removed already to check the floor for rust prevention. Think I will find the leakage next weekend. Obviously my English was good enough to hide me as a German:D

Udo
 

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Removed today my heater core off the car. It was really no cakewalk, due to the f****** spring clamps on the water hoses near the Firewall. To get them loose you have to be magician....and the removuing of the heater core drain cover is even worse, but got it done.

Other question: Mostly i`m ordering my parts from rockauto, it´s hassle free usually. But they display 5 different heater cores for the 94 BRM on the web catalog. All of the water hose connection tubes are looking quite different, with huge varying spaces between both tubes.My removed heater core seems to be from 4seasons according to the picture., the tubes are very close to each other. Just this one is the most expensive, nearly 3 times more than the others. But I´m unsure if the pics will even show the reality or maybe they are just examples? How can it be that there are 5 different cores for the 94 Buick? I´m doubting that they are displaying reality. Did anyone order from Rockauto and can advice me whats to do? Unfortunatly, in Germany I don´t can visit my local dealer to check it out...

Udo
 

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All the new ones are very low quality Chinese junk. Search "Heater Core" here on the forum and read the threads.

I found some of the original OEM units on eBay. I put one in my 1995 Impala and it DID fit for me, although it SAYS that it will only fit up to 1993. I bought it and took a chance since I own a 1992 Roadmaster as well.

I found one on eBay now, but the price is REALLY expensive. Two times the cost of the ones that were there before.

Then again, how much do you value your TIME? Many of the newer ones are known to leak soon.

Do your research, and Good luck.

http://www.ebay.com/ulk/itm/301844832485
 

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Discussion Starter #13
My car ran in Florida für 15 years before it was brought over here to Germany. Many guys here are claiming that the reason why the heater cores are going leak might be because in the hotter areas folks doesn´t use antifreeze in the coolant, at least once the car was serviced with draining the coolant and refill just water. This is prone to build up electrochemical corrosion within the heater core and maybe cooler.

Just by rumours - particular cases might be true. Ok, I`ve found a heater core what seems to fit, hoping it will work for some years, not fancy at all to remove it again....
 

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If you have a brass core, you should be able to solder it where the leak is. I used a propane torch, some rosin flux, and some plumber's solder. You could then try the Evans coolant swap. You need the system cleanout part to get rid of the water. The Evans coolant is not water based (put a warning on the radiator cap, or make it impossible to remove) and does not promote electrolysis. It also does not boil, and makes almost no pressure in the system. You also can not use sealant with it. The Evans coolant is not cheap, but may help to avoid the leaks of a conventional water based antifreeze.
 

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Thanks Fred, I've been wondering about those waterless coolants.
Googled up the Evans suggestion, and it occurred to me that this would be a great idea especially for cars that are stored up for extended periods of time.
 
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